Exercise machine



FIG. 1 shows a perspective view of the present design;

FIG. 2 shows a right side elevational view of the present design;

FIG. 3 shows a top plan view of the present design;

FIG. 4 shows a front elevational view of the present design;

FIG. 5 shows a bottom plan view of the present design;

FIG. 6 shows a left side elevational view of the present design;

FIG. 7 shows a rear elevational view of the present design; and,

FIG. 8 shows a perspective view of the present design, wherein the base is in a retracted position. 

The ornamental design for a “exercise machine”, as shown and described. 